In all four sources they have advantages of limiting car usage.

For example in Source 3 "Car-free day is spinning into a big hit in Bogota" by Andrew Selsky it says "Colombians hiked, biked, skated or took buses to work during a car-free day yesterday, leaving he streets of this captial city eerily devoid of traffic jams. This example shows how they limit car usage in Colombia.

Another example would be "When I had a car I was always tense." Im much happier this way" said Heidrum Walter." as she walked verdant streets where the swish of bicycles and the chatter of wandering children drown out the occasional distant motor." This quote from the article shows how walking turned out pretty good for her instead of driving all the time.(Source 1)

In source 4 Elisabeth states that "New York's new bike-sharing program and its skyrocketing bridge and tunnel tolls reflect those new priorites, as do a profliferation of car-sharing programs across the nation." This example shows how a program for bike sharing worked out great instead of using your cars.

In conclusion these examples from these four sources inform citizens about the advantages of limiting car usage. And there are some really good examples that inform you about limiting car usage.                    